Is this philosophy topic? Well, let's make it one...
Originally, the idea was to have a free media/press that kept the government in check by informing the people of its nefariousness. This system collapsed a long time ago in a two-fold process. First, military-industrial complex companies began buying up major media outlets until we reached the point today where hardly any "official" news comes from any independent voices. Pretty much every TV/radio/paper is owned by a handfull of companies, all with the same plan: To Keep It That Way. We can appropriately describe the modern media machine as the public relations arm of the Federal government, simply telling the people only what they want to hear in order to condition them into the next stage of any given corporate agenda. They are singing the lullaby to the zombie masses in the crib.
This is where the second part of the process comes in. For a free media to work, the people have to give a fuck in the first place. After civilization received the conveniences of modern communications, people thought that they knew it all, and stopped looking for new info. Now, the "official" word is the only one. Everything else is, by the public's perception, irrelevant.
To answer your question, mainstream media is "programming" with a false reality. What they tell the proles is not what Power is up to. On the contrary, the current media's job is to restrict precisely that kind of information flow.
Take the Wikileaks thing going on. They are exposing through leaked documents the deeper lies into the corporate and governmental structures. They ought to be commended as a beacon of accountability. But how is the media handling this? They are conditioning people into the idea that this is criminal, and some outlets are even going so far as to call Wikileaks "terrorists". In a supposedly free country, this is a very dangerous precedent to be set. It means if anyone who is not of the carefully edited corporate media tries to break through some governmental lies, well, bad things will happen to them. This is what happens when society begins to shut down under the heel of dictatorship.
They portray the Lie. At least in the USSR, Soviets knew Pravda was full of shit. Such has never been the case in the western nations.